Best Ab Exercises Ranked by Effectiveness (2026 Guide)

In an ACE-sponsored study at San Diego State University, the traditional crunch finished 11th out of 13 ab exercises for the rectus abdominis. Most people train abs with the moves they learned first, not the ones that work best. This guide ranks the ten most effective ab exercises and shows you how to combine three of them into a complete core routine.

Quick Answer

The two highest-ROI ab exercises are the hanging leg raise (top-tier muscle activation for both the six-pack muscle and the obliques) and the cable crunch (the easiest way to add load week after week). Add one anti-extension move — plank, dead bug, or ab wheel rollout — and one oblique move, and run it 2–3× per week for 6–12 total sets.

How These Are Ranked

Three criteria, weighted equally:

1. Muscle-activation evidence — EMG studies comparing ab exercises head to head, mainly the ACE/San Diego State study (2001) and two Escamilla studies (2006, 2010)
2. Loading ceiling — whether you can keep making it harder with weight, not just more reps
3. Lower-back and hip-flexor stress — how much of the work drifts to the hip flexors or lumbar spine

The abs are really three jobs: flexing the spine (rectus abdominis, the "six-pack"), resisting extension and rotation (the whole core, including the deep transversus abdominis), and rotating and side-bending (obliques). The list covers all three, because a routine that only crunches leaves two of them untrained.

The Top 10 Ab Exercises

1. Hanging Leg Raise

Hang from a pull-up bar (or support yourself in a captain's chair) and raise your legs by curling your pelvis up and toward your ribs — not just lifting your thighs.

Why it ranks #1: It tops the activation research from two directions. In the ACE study, the captain's chair leg raise ranked #1 for the obliques and #2 for the rectus abdominis. Escamilla and colleagues (2006) found hanging knee-ups with arm straps among the exercises with the highest upper-ab, lower-ab and oblique activity of everything they tested. It also progresses cleanly: bent knees → straight legs → toes to bar → ankle weights.

Trade-offs: Grip and shoulders can give out before the abs do (arm straps fix that). If you swing, or just lift the legs without tilting the pelvis, the hip flexors take over and the abs coast.

Programming: 3 sets of 8–15 slow reps, 2× per week. See the hanging leg raise page for setup; hanging knee raises with a twist shift more of the work to the obliques.

2. Cable Crunch

Kneel facing a high cable with a rope attachment held beside your head, then curl your ribs toward your pelvis, rounding your back. Your hips stay put — the spine does the moving.

Why it ranks here: It isn't one of the exercises in the classic EMG comparisons; it earns its spot on loading. The abs grow the way other muscles do — progressive load in a full range of motion — and the cable crunch is the easiest ab exercise to load precisely, in small jumps, for months.

Trade-offs: It's easy to cheat by sitting back and pulling with the arms. If the weight stack moves but your spine doesn't round, the load is too heavy.

Programming: 3–4 sets of 10–15 reps with a 2-second squeeze at the bottom. See the cable crunch page.

3. Ab Wheel Rollout

Kneel with an ab wheel under your shoulders, roll forward until your body is nearly straight, and pull back without letting your lower back sag.

Why it ranks here: In Escamilla's 2010 study, the roll-out (done there on a Swiss ball) and the pike were the most effective exercises for activating the upper and lower rectus abdominis and both obliques, while keeping lower-back and hip-flexor activity low. The 2006 study found the roll-out on the Power Wheel, a wheel device like an ab wheel, among the most effective too. It trains the abs to resist extension through a long range — exactly the job they do when you brace under a heavy bar.

Trade-offs: It's hard. Most beginners can't control a full rollout, and a sagging lower back at full extension is where it gets risky. Start with short rolls toward a wall and lengthen them as you get stronger.

Programming: 3 sets of 6–12 reps, 1–2× per week. There's no ab-wheel page in our library yet; the plank covers the same bracing position without the wheel.

4. Reverse Crunch (Incline)

Lie on a bench set to a slight incline, head at the top, knees bent, and curl your pelvis up toward your chest, lifting your hips off the pad. Lower slowly.

Why it ranks here: Escamilla's 2006 study put the reverse crunch on a 30° incline among the three most effective exercises for rectus abdominis and internal oblique activity. Because the pelvis moves toward the ribs instead of the other way round, it's also the most practical "lower abs" exercise for most people.

Trade-offs: The same study also measured high hip-flexor activity here, so the pelvis has to do the moving — if your hips don't leave the bench, you're doing leg lifts. Loading beyond bodyweight is awkward.

Programming: 3 sets of 10–15 controlled reps. See the reverse crunch page.

5. Bicycle Crunch

Lie on your back, hands lightly behind your head, and alternate bringing each elbow toward the opposite knee while the other leg extends.

Why it ranks here: In the ACE study, the bicycle maneuver ranked #1 for the rectus abdominis and #2 for the obliques — ahead of every machine and gadget tested. It's the best no-equipment option on this list.

Trade-offs: It's bodyweight only, so there's little room to add load once it gets easy. It also tempts people into fast, elbow-flapping reps; slow down and rotate from the ribs.

Programming: 2–3 sets of 12–20 slow reps per side. See the bicycle crunch page.

6. Machine Crunch

Sit in an ab crunch machine, set the pads, and curl your torso forward against the resistance.

Why it ranks here: A fixed path makes it the easiest loaded ab exercise to learn, and the weight stack gives you the same progressive overload as a cable crunch. It ranks below the cable crunch because many machines guide you through hip flexion rather than spinal flexion — the abs work, but less of the movement is theirs.

Programming: 3 sets of 10–15 reps. See the machine crunch page.

7. Plank

Forearms under your shoulders, body in a straight line, glutes and abs squeezed hard. Don't let your hips sag or pike up.

Why it ranks here: It teaches the brace you need for squats and deadlifts, and it's easy on the back. It ranks mid-table because a plank you can hold for two minutes has stopped being a strength stimulus. In the ACE study, the "hover" (plank) ranked 10th for the rectus abdominis but 4th for the obliques.

Programming: 3 sets of 20–45 seconds of maximum tension, then make it harder rather than longer: raise one foot, add a weight plate, or move to rollouts. See the plank page.

8. Side Plank

On one forearm, body straight and stacked, hips lifted. Hold, then switch sides.

Why it ranks here: It trains the obliques and the deep spinal stabilisers to resist bending sideways — a job crunches don't cover. It's also one of the three staples in Stuart McGill's well-known back-friendly core routine, alongside the curl-up and the bird dog.

Programming: 2–3 sets of 20–40 seconds per side. See the side plank page.

9. Dead Bug

Lie on your back, arms up, knees over hips. Lower the opposite arm and leg toward the floor while keeping your lower back pressed down, then switch.

Why it ranks here: It's the best place to learn to brace while your limbs move, with almost no stress on the spine. It ranks low only because it tops out quickly for trained lifters.

Programming: 2–3 sets of 8–12 slow reps per side. See the dead bug page; the bird dog is its face-down counterpart.

10. Hollow Hold

Lie on your back, press your lower back into the floor, and lift your arms, shoulders and legs so your body forms a shallow banana shape.

Why it ranks here: The gymnastics foundation for full-front tension, and a real challenge even for strong lifters. It ranks last because it's easy to perform with an arched lower back, and the load is fixed at bodyweight — shorten the lever (knees bent, arms by your sides) until you can hold the position with your back flat.

Programming: 3 sets of 15–30 seconds. See the hollow hold page.

What to Skip

• Anchored-feet sit-ups — in Escamilla's 2006 study, the bent-knee sit-up was among the exercises with the highest rectus femoris (hip-flexor) activity. Your hip flexors do much of the lifting.
• Ab gadgets and infomercial devices — in the ACE study, the Ab Rocker finished last of all 13 exercises for both the rectus abdominis and the obliques.
• Hundreds of fast crunches — endurance, not growth. If you can do 30 easy reps, add load or switch to a harder variation.
• Heavy side bends for a "smaller waist" — they train the obliques like any other exercise; they don't burn waist fat.

How to Build a Week

The shortest complete ab routine — two sessions, three moves each:

• Session A: hanging leg raise 3×10 + side plank 2×30s per side
• Session B: cable crunch 3×12 + ab wheel rollout 3×8

That's 11 weekly sets covering all three jobs: flexion (leg raise, cable crunch), bracing (rollout) and the obliques (side plank, plus the leg raise). Add them at the end of any two training days; abs don't need a day of their own.

The two-session version is a floor: add a plank or a set of bicycle crunches to either day if you have time.

Short on time? Two moves twice a week — hanging leg raise and cable crunch — covers the six-pack muscle and the obliques, and your squats and deadlifts handle the bracing. For more on weekly volume, see how many sets per week build muscle.

The Bottom Line

Train all three jobs: one flexion move you can load (hanging leg raise or cable crunch), one anti-extension move (rollout, plank or dead bug), and one oblique move (bicycle crunch or side plank). Progress them like any other lift — more load or a harder variation, not endless reps. And remember that visible abs are revealed by overall fat loss, not built by crunches alone: in a 2011 study, six weeks of ab training reduced abdominal fat no more than doing nothing.